Geology and geochemistry of metabasic rocks from aÇungui supergroup, north of quarenta oitava shear zone, south of sÃo paulo state

Detalhes bibliográficos
Autor(a) principal: Vieira, Otávio Augusto Ruiz Paccola [UNESP]
Data de Publicação: 2020
Outros Autores: Godoy, Antonio Misson [UNESP], Luvizotto, George Luiz [UNESP], Zenero, Jonas Menezes [UNESP]
Tipo de documento: Artigo
Idioma: por
Título da fonte: Repositório Institucional da UNESP
Texto Completo: http://dx.doi.org/10.5016/geociencias.v39i1.14661
http://hdl.handle.net/11449/207033
Resumo: Basic and ultrabasic ortho-derived rocks are composed of amphibolites, metabasites and metaultrabasites of meso to neoproterozoic age, are located in the southwest of São Paulo State, in Ribeira Belt southern portion and north of Apiaí Terrain. They are inserted in Supergroup Açungui metavolcanicsedimentary rocks, specifically in Água Clara Formation and Itaiacoca Group The main mineral paragenesis consists of ferrotschermakite- ferrohornblende- magnesiohornblende ± oligoclase andesine, representing the progressive regional metamorphism M1 climax, from 611 °C to 621 °C in temperature and 6.5 kbar to 7.3 kbar (± 0, 6) (Mid amphibolite facies); and a mineral paragenesis of actinolite tremolite ± albite, from M3 regional retrometamorphism (low to mid greenschist facies). Compositional geochemical data classify the rocks as gabbro, basanite and picrite, low potassium sub alkaline to alkaline, Fe-tholeitic to Mg-tholeitic, with a slight tendency to komatiitic basalts. Geotectonic data, corroborated by the behavior of trace elements and REEs, indicate three main signatures for amphibolitic groups: Basic tholeitic and komatiitic rocks associated with mid-ocean ridge (MORB), with possible crust interaction in subduction phase; ultrabasic alkaline ocean island rocks (OIA); and island arc tholeiitic basalts. Therefore, magmatism is correlated to the initial stage of opening of the basin or to the beginning of closure, to the initial phase of tholeitic ocean floor nature, associated with ocean island alkaline basalts.
id UNSP_29760fc25836a47b014ce6455ef632c7
oai_identifier_str oai:repositorio.unesp.br:11449/207033
network_acronym_str UNSP
network_name_str Repositório Institucional da UNESP
repository_id_str 2946
spelling Geology and geochemistry of metabasic rocks from aÇungui supergroup, north of quarenta oitava shear zone, south of sÃo paulo stateGeologia E Geoquímica Das Rochas Metabásicas Do Supergrupo Açungui A Norte Da Zona De Cisalhamento Quarenta Oitava, Sul Do Estado De São PauloAçungui SupergroupGeochemistryGeologyMetabasicBasic and ultrabasic ortho-derived rocks are composed of amphibolites, metabasites and metaultrabasites of meso to neoproterozoic age, are located in the southwest of São Paulo State, in Ribeira Belt southern portion and north of Apiaí Terrain. They are inserted in Supergroup Açungui metavolcanicsedimentary rocks, specifically in Água Clara Formation and Itaiacoca Group The main mineral paragenesis consists of ferrotschermakite- ferrohornblende- magnesiohornblende ± oligoclase andesine, representing the progressive regional metamorphism M1 climax, from 611 °C to 621 °C in temperature and 6.5 kbar to 7.3 kbar (± 0, 6) (Mid amphibolite facies); and a mineral paragenesis of actinolite tremolite ± albite, from M3 regional retrometamorphism (low to mid greenschist facies). Compositional geochemical data classify the rocks as gabbro, basanite and picrite, low potassium sub alkaline to alkaline, Fe-tholeitic to Mg-tholeitic, with a slight tendency to komatiitic basalts. Geotectonic data, corroborated by the behavior of trace elements and REEs, indicate three main signatures for amphibolitic groups: Basic tholeitic and komatiitic rocks associated with mid-ocean ridge (MORB), with possible crust interaction in subduction phase; ultrabasic alkaline ocean island rocks (OIA); and island arc tholeiitic basalts. Therefore, magmatism is correlated to the initial stage of opening of the basin or to the beginning of closure, to the initial phase of tholeitic ocean floor nature, associated with ocean island alkaline basalts.Programa de Pós-Graduação em Geociências IGCE UNESP-Univ Estadual PaulistaDepartamento de Petrologia e Metalogenia IGCE- UNESP Universidade Estadual Paulista, Av. 24A, 1515-Bela VistaPrograma de Pós-Graduação em Geociências IGCE UNESP-Univ Estadual PaulistaDepartamento de Petrologia e Metalogenia IGCE- UNESP Universidade Estadual Paulista, Av. 24A, 1515-Bela VistaUniversidade Estadual Paulista (Unesp)Vieira, Otávio Augusto Ruiz Paccola [UNESP]Godoy, Antonio Misson [UNESP]Luvizotto, George Luiz [UNESP]Zenero, Jonas Menezes [UNESP]2021-06-25T10:47:54Z2021-06-25T10:47:54Z2020-01-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article21-46http://dx.doi.org/10.5016/geociencias.v39i1.14661Geociencias, v. 39, n. 1, p. 21-46, 2020.1980-900X0101-9082http://hdl.handle.net/11449/20703310.5016/geociencias.v39i1.146612-s2.0-85098447221Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPporGeocienciasinfo:eu-repo/semantics/openAccess2021-10-23T16:01:08Zoai:repositorio.unesp.br:11449/207033Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T16:48:59.553561Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false
dc.title.none.fl_str_mv Geology and geochemistry of metabasic rocks from aÇungui supergroup, north of quarenta oitava shear zone, south of sÃo paulo state
Geologia E Geoquímica Das Rochas Metabásicas Do Supergrupo Açungui A Norte Da Zona De Cisalhamento Quarenta Oitava, Sul Do Estado De São Paulo
title Geology and geochemistry of metabasic rocks from aÇungui supergroup, north of quarenta oitava shear zone, south of sÃo paulo state
spellingShingle Geology and geochemistry of metabasic rocks from aÇungui supergroup, north of quarenta oitava shear zone, south of sÃo paulo state
Vieira, Otávio Augusto Ruiz Paccola [UNESP]
Açungui Supergroup
Geochemistry
Geology
Metabasic
title_short Geology and geochemistry of metabasic rocks from aÇungui supergroup, north of quarenta oitava shear zone, south of sÃo paulo state
title_full Geology and geochemistry of metabasic rocks from aÇungui supergroup, north of quarenta oitava shear zone, south of sÃo paulo state
title_fullStr Geology and geochemistry of metabasic rocks from aÇungui supergroup, north of quarenta oitava shear zone, south of sÃo paulo state
title_full_unstemmed Geology and geochemistry of metabasic rocks from aÇungui supergroup, north of quarenta oitava shear zone, south of sÃo paulo state
title_sort Geology and geochemistry of metabasic rocks from aÇungui supergroup, north of quarenta oitava shear zone, south of sÃo paulo state
author Vieira, Otávio Augusto Ruiz Paccola [UNESP]
author_facet Vieira, Otávio Augusto Ruiz Paccola [UNESP]
Godoy, Antonio Misson [UNESP]
Luvizotto, George Luiz [UNESP]
Zenero, Jonas Menezes [UNESP]
author_role author
author2 Godoy, Antonio Misson [UNESP]
Luvizotto, George Luiz [UNESP]
Zenero, Jonas Menezes [UNESP]
author2_role author
author
author
dc.contributor.none.fl_str_mv Universidade Estadual Paulista (Unesp)
dc.contributor.author.fl_str_mv Vieira, Otávio Augusto Ruiz Paccola [UNESP]
Godoy, Antonio Misson [UNESP]
Luvizotto, George Luiz [UNESP]
Zenero, Jonas Menezes [UNESP]
dc.subject.por.fl_str_mv Açungui Supergroup
Geochemistry
Geology
Metabasic
topic Açungui Supergroup
Geochemistry
Geology
Metabasic
description Basic and ultrabasic ortho-derived rocks are composed of amphibolites, metabasites and metaultrabasites of meso to neoproterozoic age, are located in the southwest of São Paulo State, in Ribeira Belt southern portion and north of Apiaí Terrain. They are inserted in Supergroup Açungui metavolcanicsedimentary rocks, specifically in Água Clara Formation and Itaiacoca Group The main mineral paragenesis consists of ferrotschermakite- ferrohornblende- magnesiohornblende ± oligoclase andesine, representing the progressive regional metamorphism M1 climax, from 611 °C to 621 °C in temperature and 6.5 kbar to 7.3 kbar (± 0, 6) (Mid amphibolite facies); and a mineral paragenesis of actinolite tremolite ± albite, from M3 regional retrometamorphism (low to mid greenschist facies). Compositional geochemical data classify the rocks as gabbro, basanite and picrite, low potassium sub alkaline to alkaline, Fe-tholeitic to Mg-tholeitic, with a slight tendency to komatiitic basalts. Geotectonic data, corroborated by the behavior of trace elements and REEs, indicate three main signatures for amphibolitic groups: Basic tholeitic and komatiitic rocks associated with mid-ocean ridge (MORB), with possible crust interaction in subduction phase; ultrabasic alkaline ocean island rocks (OIA); and island arc tholeiitic basalts. Therefore, magmatism is correlated to the initial stage of opening of the basin or to the beginning of closure, to the initial phase of tholeitic ocean floor nature, associated with ocean island alkaline basalts.
publishDate 2020
dc.date.none.fl_str_mv 2020-01-01
2021-06-25T10:47:54Z
2021-06-25T10:47:54Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://dx.doi.org/10.5016/geociencias.v39i1.14661
Geociencias, v. 39, n. 1, p. 21-46, 2020.
1980-900X
0101-9082
http://hdl.handle.net/11449/207033
10.5016/geociencias.v39i1.14661
2-s2.0-85098447221
url http://dx.doi.org/10.5016/geociencias.v39i1.14661
http://hdl.handle.net/11449/207033
identifier_str_mv Geociencias, v. 39, n. 1, p. 21-46, 2020.
1980-900X
0101-9082
10.5016/geociencias.v39i1.14661
2-s2.0-85098447221
dc.language.iso.fl_str_mv por
language por
dc.relation.none.fl_str_mv Geociencias
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 21-46
dc.source.none.fl_str_mv Scopus
reponame:Repositório Institucional da UNESP
instname:Universidade Estadual Paulista (UNESP)
instacron:UNESP
instname_str Universidade Estadual Paulista (UNESP)
instacron_str UNESP
institution UNESP
reponame_str Repositório Institucional da UNESP
collection Repositório Institucional da UNESP
repository.name.fl_str_mv Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)
repository.mail.fl_str_mv
_version_ 1808128706294579200